Add Simplified Chinese (zh-CN) localization to the desktop app

What problem are you trying to solve?

I work primarily in Chinese. The assistant responds in Chinese without any
issue, but the desktop interface is English-only — there is no option to
change the interface language anywhere in Settings. So every navigation
label, settings page, button, dialog, and system message has to be read in
a second language, which adds constant low-level friction to everyday use.

What would improve it?

Simplified Chinese localization for the desktop app — at minimum the
surfaces I see most often: navigation, Settings, buttons, dialogs, and
system messages.

A language option in Settings (System default / English / 简体中文) would
be a good starting point. Even a partial translation of the most frequently
seen screens would be a meaningful improvement. Ideally the CLI would
follow, but the desktop is where it matters most for me.

I understand full localization is a large undertaking, so I'm not expecting
complete coverage immediately.

What do you do today?

Read all interface text in English. I've gotten used to the common labels,
but unfamiliar or newly added screens still take extra effort to parse.

Product area

None

Beginne damit, die Spracheinstellungen der Desktop-App unter Settings sowie den Code oder die Ressourcen für Navigation, Schaltflächen, Dialoge und Systemmeldungen zu finden. Definiere den anfänglichen Umfang für Simplified Chinese und wie die Option neben System default und English angezeigt wird. Als erledigt gilt die Aufgabe, wenn die ausgewählte Sprache die vereinbarten Desktop-Oberflächen ändert und die teilweise Abdeckung klar dokumentiert ist.